Improvement in sewing-machines



3 Sheets-Sheet 1.

L. W. LANGDON.

Sewing Machine.

Patented Oct; 30, 1855.

3 SheetsSheet 2.

L. W. LANGDON.

Sewing Machine.

Patented Oct. '30, 1855.

3 Sheets-Sheet 3. L W. LANGDON.

Sewing Machine.

Patented Oct. 30, 1855.

1 To all whom it may concern:

UNITED STATES L. w. LANGDON, or no ATENT OFFICE.

CHESTER, NEV YORK.

IMPROVEMENT IN,SEWING=MACH INES.

Be it known that I, L. \V. LANGDON, of Rochester, in the county ofMonroe, in the State of New York, have invented a new and usefulImprovement in Se\ving-l\Iachines; and I do hereby declare that thefollowing is a full and exact description thereof, reference being hadto the accompanying drawings, and to the letters of reference markedthereon, the same letters designating like parts.

Figure 1 is a front view with the work-plate removed. Fig. 2 is a sideview. Fig. 8 are sectional views representing different sections of themachine detached.

To enable others skilled in the art to make and use my invention, I willproceed to de scribe its construction and operation.

In the construction of my machine, Fig. 1, letter A is the base, onwhich the stationary face-plate for keeping the shuttle in its placerests. B is the lower end or arm of the stationary face-plate, let intothe base by means of a groove, and fastened in its position by thethumb-screw O.' D is the need1e-bar, with the wrist a fitting through itfor clamping the needle, the eye of which I place in a horizontal linewith the shuttle. E is a spool attached to the needle-bar by means of astud fitted to the bar. F is the spring bearing on the spool, with theset-screw G bearing on the spring, to give it the tension necessary toregulate the thread. His the needle-bar rocker-shaft, held in its properplace by set-screws I I. J is a portion of the frame-work through whichthe screws I I pass, and extends forward to the face-plate for thepurpose of retaining the presser, as seen in Fig. 2. K is the looper forcarrying the thread to the left side of the needle for tying the knot,and is operated by the cam L. M is the combined'eccentric yoke formoving the needle. N is a driving-pulley over which a belt passes fordriving the machine. O is an adjustable lever fitted into the slide-barP, and attached to the under side of the work-plate as its fulcrum forthe purpose of changing the feed from a half to whole knot. Q is aconnecting-rod attached to the rock-shaft H, to which are attached theadj ustable set-screw and rollers R R, and passes through a slot on thelower side of slide-bar P. S is a spiral spring operating against theslide-bar P, and held in its place 011 the con necting-rod Q by means ofa pin for the purpose of producing an equal pressure of the roller R onthe cams 'I T, which, with the cogwheel U, revolve on the stud 3 V (Seenin Fig. '3, section 2.) V V are upright portions of the frameworkthrough which the main shaft passes, and to which the work-plate issecured. WV is the stationary circular shuttle-box in which the shuttlerevolves, and which is secured properly in its place by the stationaryface-plate B. x x are two set-screws for fastening the upper portion ofthe frame J to the uprights I), as seen in Fig. 2. Letter Y is a springfor holding the looper against the cam L. I

Fig. 2, letter Z) is an upright column to which the upper part of theframe J is attached by the set-screws 00 w, as also seen in Fig. 1.Letter 0 is a portion of the frame extending up to assist in supportingthe frame J. (I is the arm connecting the rod M with the rock-shaft H. eis a spiral spring around the looper-shaft f, secured in boxes 9 g,which boxes are fastened to the stationary shuttle-box XV.

Fig. 1,.letters i i M are the revolving faceplate and shuttle as theydescribe their circuit. Letter h is the snail'screw or worm 011 the center of the faceplate for the purpose of holding the thread out of theway of the looper until the knot is tied, and then casting it off intime for the stich to be drawn up. jis the presser I for holding thematerial in its place while be ing sewed. k is a small spring attachedto the work-plate I, over which the thread is passed from the shuttlefor the purpose of keeping it from being caught by the looper when thema chine is being started.

In Fig. 3, Drawing 1 is a sectional view in which is shown more fullythe operation of the machine in forming the knot. is the shuttle withthe bobbin in it, the thread of which passes around the snail screw orworm to the cloth. D is theneedle-bar, and a the wrist,

- in which is placed the needle m and the thread at passing through it.

In Drawing 3. letter (1 is the connectingrod detached, showing thesliding step which is let into the end of the rocker-shaft H, giving ita vibrating motion, and thus causing the needle to feed. 0 is the pinionon the outer end of the main shaft for driving the gearwheel a. Drawing3 is a sectional View of the cams and yoke for moving the needle. 1) qare the two cams that play within the yoke M. Cam 11 operates on theright handand upper ing from the shuttle.

side and back end of the yoke M. Cam q operates on the left side and onthe bottom and front end of the yoke M. M X is a section of the yokedetached, showing its projection to the left. Fig. 3, Drawing 4 is theshuttle with the bobbin in it. 1' is the bobbin. 8 is a spring forholding the bobbin in the shuttle. t is a set-screw operating against aspring, a, for the purpose of regulating the thread pass- The threadfrom the bobbin 1', in passing from the shuttle, follows the directionof the arrows 'v 1), that it may pass lengthwise under the spring a.

Fig. 8, Drawing 5, w represents the stitch as made with the half-knot.00 represents the stitch as made with a whole knot between each stitchnot entirely'drawn up.

In operating my machine, I drive my revolving face-plate on the mainshaft by means of a crank or handle, or by means of a belt on thedriving-pulley N, thereby causing the shuttle to revolve in its orbitand the needlebar to vibrate vertically. When the needle passes throughthe cloth as it begins to recede, the thread is taken by the looper andcarried across the path of the shuttle to the left side of the needle,thus forming a loop,

where it is held until the shuttle passes through the loop, when thelooper'recedes to its position. As it recedes, the motion of the shuttleis accelerated by the loopcr pressing on the rear end of the shuttle andquickly sliding it forward in its bed, thus giving to the shuttle agreater velocity in passing the eye of the needle than at any otherportion of its orbit, and as the shuttle passes around, the thread iscaught on the snail screw or worm h, where it is held until the knot'istied, and then casting it off in time for the stitch to be drawn up,thus making a half-knot stitch at every revolution of the shuttle. Bychanging the lever 0 to the right, the needle-bar is made to vibratetwice in the same line before feeding, and as the needle enters twice inthe same place, and the shuttle in its revolutions passes through twosuccessive loops without feeding the material forward, a whole knot isthus formed, similar to one made made by hand.' In operating themachine, to avoid the difficulty by the wearing away of the cams p q,

I have so constructed my yoke M that by two set-screws I can remove thefront part, M X,

of the yoke, and by filing away the ends-of the yoke M, I can tighten itand keep it always tight, thus always keeping up the lost motion. Thechange of feed is effected by means of the adjustable lever 0, operatingon the slide-bar I, which moves the roller R and changes its bearingalternately on the cams T T, and thus tying a half or whole knot at thewill of the operator. By moving the lever 0 to the left, a half-knot ismade, and by moving it to the right a whole knot is made. The shuttle inits revolution passes on the opposite side of the needle from which theseam is formed. The length of the stitch is effected by means of theadjustable set-screw R at the end of the connecting-rod q. By turning itto the left the stitch is shortened. By turning it to the right thestitch is lengthened.

Having thus fully described the operation and construction of mymachine, what I claim as my improvement, and desire to secure by LettersPatent, is

1. Making a stitch by tying a halfknot or awhole knot at the will of theoperator, in the manner herein set forth and described.

'2. The snail-worm on the revolving vertical face-plate, for the purposeof holding the thread until the knot is tied, and then casting it off intime for the stitch to be drawn up.

3. The vertical face-plate, into which the shuttle is set for thepurpose of carrying it around, and the reaction of the loopcr K forquickening the motion of the shuttle as it passes the needle for thepurpose of letting the loopcr pass out freely. I

4. I do not claim, broadly, feeding the cloth by the motion of theneedle; but what I do claim is feeding the material by the needle, whencombined and arranged with the lateral motion of the needle in themanner describedthat is to say, in connection with the-rockshaft II,with the sliding step in the end, the connectingrod q, the spring S, theset-screw and rollers R R, the cams T T, the sliding bar P, and theadjustable lever 0, as set forth.

L. \V. LANGDON. \Vitnesses:

JOHN L. SMITH, T. G. CLAYTON.

